Typewriting machine



w. F. HELMOND 1,762,173

TYPEWRITING MACHINE June 10, 1930.

Filed April 23, 1928 Patented June 10, 1930 warren "s TE-is WILLIAM F, HnLMonnoF wns'r HARTFORD, oonnnorrour, nests-iron T unnnnwoon A ELLIOTT rrsnna COMPANY, or NEWYORK, N, n. conronarron OF DELAWARE wrswmme 'MAoHINn Application filed Apri1l23,

, This invention relates mainly to the shiftframe bearings of typewriting machines. I Heretofore, difficultyand expense have been encountered, inproperly assembling a typewriting machine, at certain points where,

a fulcrum is required. This is particularly true in obtaining a proper adjustmentofthe platen lift-rail, which, for accurate alignment of the typed cl1aracters,must'be pan allel with the-carriage Way-rods Formerly, due to variations in the machining of parts, it has often been necessary to assemble and disassemble several times the component parts of the lift-rail unit, until by successive slight adjustments the proper total adjust. ment has been consummated. Whatzis true of the lift-rail and its proper. adjustment is also true of other parts or units, such as 7 the dog-rocker arm, tabulator, shift-lock, and

lift-hooks.- a Y c It is an object of the present invention to overcome the above disadvantages, and to substitute a simple means whereby fulcrum ad ustments may be easily, qu1ckly,-'andpermanently made.

A further object of this invention is to' providean oft-center fulcrum'thatmay with stand alesser or greater torsional strain. Such withstanding of torsional strain is dependent on the amount of frictional resistance set up between the fixed bushing and the curved, stem carrying the offcenter'fulcrum. This resistance can be varied by fiattening or sharpening the curve orarc o f the stem, or by decreasing or increasing its di; ameter. i r r I V p 1 In addition the stem may be tempered to decrease or increaseits bow-spring'quality. Finally, a combination of any or all methods may be employed. l v v The invention therefore relates to a-n-im proved means for providing an adjustable fulcrum,rwhereby the fulcrum can be set at various points in a line paralleling itsaxis, and alsoin a plane at right angles thereto. Furthermore, when said fulcrum has been adjusted and set in "proper relationlto 'some engaging member, the fulcrum and its component parts can be integrally removed and again be replaced in'their housing, without up wear on itself or inthe engaging menu-- ofthesef 1923., Serial No. 272,052;

tion. s I c Anobject of this invention is to provide an adjustable fulcrum having, few compo,-

nent parts, all of which are durable, and are easily and economically made and installed- Furthermore, a rotatable fulcrum-stud, as

hereinafter described, can be utilized to take ber, and without disturbing its bushing.

S'These' improvements are, particularly applicable to typewriting--machines, but can" inafter appear;

, In the accompanying drawings,

readily and advanta eously be incorporated Figure l is a side elevation of a portionof a typewriting :machine with the present invention applied thereto and'showing the platen shifted to upper-case position;

Figureflis a plan View. of the adjustable supporting mechanismywith the parts in section jvfor clearly. V I

c Figure 3 .18 a rear showing the invention more viewshowing the relation between the carriage-rails and thesh'iftrail and the adjustable supports for'the lat V ter rail. 7 I v 1 Figure 4 is a perspective view of thebushing and the off-center stud together with its curved stem prior to b'eing'assembled. j

Figure 5 is a similar View to Figure 4 but-showingthe parts assembled.

Figure, 6 is a front diagrammatic view showing the platencjshifted and supported by its shift-rail for typing with the upper-E caselcharacters.

' Type-bars 1O are su' ung up torstrike the platen ll'having a shaft 12 carried by end plates 13 off-a platen-fraine lt mounted for vertical movement in a carriage-frame l5, andgulded in said vertical movement by the usual arms l6and l7. The carriage'isjfed horizontally"through the usual ,escapement- ,mechanism 18, and is guidedrby a front rail 19 and a rear rail 20 carried bya stationary main frame 21 The carriage 'is supported on the front "rail 19 'by a'roller 22 suitably 7 mounted on its front bar 23. The guiding the carriage-frame 15.

means at the rear of the carriage includes the rear rail 20, which is embraced by collars 2d fixed upon the rear bar of the carriage.. Theplaten 11 is supported in its lower or nor ial position by the end-plates l3 reseing on theicarrlage-irame 15. For this purpose the plates. are provided their rear with flattened'edges 26 to abut and rest on studs 27 forming part oft-he carriage, and are 'fhrther supported at the: front by extensions 28' of the plates- 13 abutting the arms 29 of The platen is shifted to its upper position by operation of the usual shift-key lever 30 causingits vertical arm 31 to rock a swingin'g frame 32 including a pair of pivotally mounted brackets 32 fixed to the ends of a cross shaft 33, and raiseJa guidesrail 3%, which, in turn, through a roller 85, raises the platen-frame 14 lhe rail 3-l is held in its raised or normal position by the usual holding mechanism shown in my latent No. 1,223,279 of April 17, 1917, which includes a pivoted lever 86 carrying at'its end an adjustable extension 37 provided with vertical 7 slots 38 and 39. A pin 40 onthe bracket 82 enters either the slot 38 or 3 9, according to whether the rail 34 is moved to its loweror upper locked position.

VVlie-nthe rail is held in its upper position by means of the operator holding the shift-hey down, the pin 40 remains in caset nin characters are t aed that the A D x 7 rail i341 be in perfect horizontal alignment with the carriage-rails 19 and 20 upon which the platen is directly supported in its lower position. For this purpose the brackets 32, together with the rail 34: fixed thereon are adjustablysupported for the trueing or said rail. The adjusting mechanism or unit includes a metal bushing d1, along the axis ofwhich has been bored a hole 4-2. In hole 42' is placed a metal stem 43,'having a tool head-44, at one end, substantially the same size as the diameter of the bushing. Said head 44 hasits periphery cut with a plurality of faces, to be readily turned by a wrench. bracket-supporting fulcrum stud or pin 45, set axially off-center from the stem or shank 4.3. The tool-head 44: is between theshank and the stud, and can slip through the hole 46. Said stem is made to have a normally easy fit in the hole 42, but before insertion 'in the latteris bent o-rflexed slightly to assume an arc. Said aroconstitutes a bowsp'rrng, which, when forced lnto the bushing,

From head le there projects a' gives the stem a frictional resistance at several points along the walk of the hole 42, in bushing ll. Said resistance is anti-torsional, and is suiiicient to prevent the stem from being turned by the weight or st "am of the supported membeiz. Said torsional movemen is transmitted to the stem through the leverage set up by the supported member acting on the oilset fulcrum-stud lo. I

l/Vhen assembled, the fulcrmn-unit; is placed in an opening 46 of theframe 21, as shown by Figure 3, and is moved axially to its proper position in said hole. Vhile in such position thebushing ll is fixed by screwing in a set-screw (l7. Said screw preferably has a fiat end that. abuts the fiat cutout as, of the bushing ll, and holds said bushing against turning or sliding. hen the bushing 41 has been thus properly fixed, the stem 43'is turned by its head 4.4, to bring the fulcrum-stud to proper position in. its radial plaue'for trucing the rail It will be apparent that,while stem 43 will not turn inits bushing all from a working strain applied to its fulcrum-stud 45, it can be turned by a greater force applied through its head 44. It also obvious that once the stem 43. has been properly adjusted in the bushing 41-1, the wholeu it may then be removed, without disturbing the relation of its 4 component parts. In addition, the undisturbed unit may then be replaced at its exact previous location in the. frame, and without changing the preadjusted relation between its fulcrum-stud and the supported member. This axial. preadjusted location can, be again reached, when the head 4 has abut-ted its supported member. Such axial location can also be gaged by an observance through the set-screw hole of any mark or depression lefton the cut-out 48, by the set-screw 47, when the latter received its initial set. The setscrew also embodies another desired result. When it is threaded in to abut said cut-out, the resultant pressure of its end brings said. cut-out into the same plane as previously occupied. The bushing thus having been correctly relocated, it follows that its, component fulcrum-stud will also assume its preadjusted location in relation to its supported member.

It can readily be seen. that the off-center support can be used for either both ends or only one endof the supported member, which would be determined by the amount of'adjustment necessary forthe rail 34. When the rail 3% is adjusted by movement of the bracket 82 through its off-center support 45, the holding extension 37 has to be correspondingly adjusted on the lever 36 to bring the slots 38 and 39 into proper relation with the pin 40. For this purpose the extension is provided with a slot as) through which a screw 50 extends, so that upon loosening of the screw 50 the extension may be slidably adjusted to bring the slots 38 and 89 in proper registration with the pin 40.

The. extension 37 is further provided with inwardly-extending lugs 51 for guiding and maintaining its proper relation on the lever 36 when it is 'slidably adjusted.

Variations maybe resorted to within the scope of the invention, and portions of the" I stem and thereby tension the same to frictionally bind upon the wall of the pp nin 2. An adjustable supporting unit includlng a bushing having a circular opening and an off-center pin having a normally flexed stem, press fitted in said opening so that the bushing is effective to straighten the stem and thereby tension the same to frictionally bind upon the'wall'of the opening and hold said oE-center pin in a fixedrelative position to the bushing, the bushing beingprovided with means to determine its j fixed position when secured in a housing.

3. The combination with a supported member and a housing, of a unit rigidly mountable in the housing and including a bushing, and an adjustable oif-center stud carrying the supported member, said stud forming part of a head having a stem arranged in the bushing, said stem being normally flexed and press fitted into the bushing whereby the stem Jis'held against displacement from the bushing by its in-.

herent resiliency. i V a 4;. The combination with a supported vmember and a housingfof a unit rigidly mountable 1n the housing and lncludlng a.

bushing, and an adjustable'olf-center stud carrying the supported member, saidstud forming part of a head having a stem arranged in the bushing, said stem being nor.

mally flexed and press fittedinto the bush- .r

ing whereby the stem is frictionallyheld against displacement by virtue of its own resiliency, the head on said stem being provided with a gripping surface to enable a sufficient rotating force to be applied thereto for overcoming said frictional resistance to adjust said off-center stud.

5. The combination with a supported member and 'a housing, of a unit rigidly mountable in the housing and including V bushing, and an adjustable oif-centerstud. 1

carrying the supported member, said stud forming part'of a head having a stems ar ranged in the bushing, saidstem being norplacement'from the bushing by its inherent resiliency, said unit beingjheld rigid to, prein its housing by, means of a holding screw threaded in said housing; c 6. The combination with a supported vent it from sliding orrotating when placed 'member and iahousing, of a unit rigidly, I

mountable in the housing and including ,a'f

bushing, and an adjustableoff-center stud carryingthe supported member, said stud forming part of ahead having a stem arranged in the bushing, said stem being normally flexed and press fitted into the bushing whereby the stemis held against displacement from the bushing by itsinher- 'ent resiliency, said unit being held rigid to prevent it from sliding orrotating when placed in its housing by means of, a holding screw threaded in said housing the bushing being provlded with a flattened surface agalnstwhich a flattened end of said screw may bear for relocating saidunit when it is replaced in its housing;

7. The combination with a supported member anda main frame, of a bushing removably fitted in said "main frame',;an olfvcenter stud carrying the supported member,

said stud being rotatable in said bushing and'having means co-operative with 's'aid' bushing'for firmly holding the stud at clifferent rotative adjustments in said bushing, said bushing with said adjusted stud being detachable as ajunlt, and means for mechanically re-locating and holding said bushlng after detachment and replacement thereof, and thereby preserving the adjustment of said stud.

8'. The combination" with a supported member and a main frame, of a bushing removably fitted in said main frame, an offsaid stud being irotatable. in said bushing and having means co-operative withsaid bushing for, firmly holding the stud at different rotative adjustments in said bushmg, said bushing with said adjusted stud being. detachable as a unit, and means" for mechanically re-locating and holding said bushing after detachmentand replacement thereof, and thereby preserving the adjustment of said stud, said main frame having a hole in which said bushingis fitted, and

said stud having a shank rotatively fitted in said bushing," and having a tool-head between the shank' and the stud; said hole he ing of sufiicient diameter to permit the passage of said tool-head;

mally' flexed and press fitted into the bushing whereby thestem isheldagains .105 center stud carrying the supported member, 4

I LI M F. I-I L ONDQ- i 

